Ohmart Vega W-4510, Technical Reference Hardware Manual

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Introduction
W-4510 Weigh Scale Technical Reference Manual 9
Principles of operation
Ohmart’s W-4510 Weigh Scale is a nuclear gauge that mounts outside the conveyor
footprint. The detector receives a narrow beam of radiation, through the process material,
from the source holder.
The amount of radiation that the detector senses is in proportion to the amount of the
material’s mass. Since the radiation source and detector are always the same distance apart,
the only possible change in signal is directly a measure of the loading belt. A belt with a light
load allows more radiation to pass through to the detector. A belt with a heavier load allows
less radiation to pass through to the detector.
The Smart Pro calibrates the W-4510 Weigh Scale output and associates the digitized
detector readings, known as counts (the detector frequency output), with the loading of the
belt, in engineering units. The output range of the Smart Pro with the W-4510 Weigh Scale
are two
4–20mA current loop signals, in proportion to either the loading (pounds per linear foot), or
weight transfer rate (pounds per hour). In addition to the analog outputs, there are up to four
process relays available to convey totalization or other configurable alarm conditions.